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Using common factors,

7, 14, 21, 28, 35, 42, 49, 56, 63, 70

8, 16, 24, 32, 40, 48, 56, 64, 72, 80

Between 40 to 75 biscuits.

if pack by 7 will left 2, therefore possible answer is 42+2, 49+2, 56+2, 63+2 or 70+2.

                                                                                              (44),  (51),    (58),   (65),  or  (72)

if pack by 8 will short buy 7, therefore possible answer is 48-7, 56-7, 64-7, 72-7 or 80-7

                                                                                                         (41),  (49),   (57),  (65) or (73)

Of all the possible answers only 65 matches with each other.

Therefore, Matthias have 65 biscuits.

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